Half to henry m



(No Model.)

- y E. V. TANNER Machine for Grinding Plug Valves.

No. 237,784. Patented Feb. 15,1881.

UNTTEE STATES IIPATENT FFKCEQ EDGAR V. TANNER, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNOR OF ONE- HALF TO HENRY M. BREWSTER, OF SAME PLACE.

MACHINE FOR GRINDING PLUG-VALVES.

SPECIFICATION forming part of Letters Patent No. 237,784, dated February 15, 1881.

I Application filed December 8, 1880. (No model.)

To all whom it may concern: "n is the plug of a cock secured in the ma- Be it known that I, EDGAR V. TANNER, a chine, and is the body thereof.

citizen of the UnitedStates,residingatSpring- Fitted to the spiral portion of spindle h is a field, in the county of Hampden and State of nut, 1", made in halves, which are secured one Massachusetts, have invented new and useful to the other by screws, as shown, and the two 5 Improvementsin Machines for Grinding Plugouter sides of said nut have grooves a: a there- Gocks, of which thefollowingisa specification. in, as seen in Fig. 4, in which are fitted two My invention relates to the details of conslides, 8, provided with pivots s.

struction of a machine for holding and recip- A bell-crank lever, D, is hung, by asuitable 1o rocally rotating the plug of a cock while the fulcrum connection, to the under side of bed body thereof is held and forced against it, so A, as shown, and the end of its vertical arm as to grind .the plug to its place in the body, passes up through said bed andthrough the the object being to provide a machine which base of the head-stock, through a slot in the can be adjusted to reciprocally rotate a plug latter, and is bifurcated, as shown in Fig. 2,

15 to greater or less degree, rotate it with perfect and its two arms are pierced to receive the steadiness of motion, and with the least possipivots s on slides s, and nut r is placed beble shock when the motion changes, and one tween said slides, as in Fig. 2. In Fig. 1, spinwhich is practically noiseless in its operation. dle h, the said nut, and the end of the lever D,

In the drawings forming part of this speciin which it operates, are all seen in their re- 20 fication, Figure 1 is a side elevation of my imspective operative positions. The horizontal proved grinding-machine, in which is shown 'arm of lever D is provided with a slot, a, near the plug of a cock secured between its centers, its end. and the body thereof hanging upon one of Upon the girth c is mounted, in suitable them in the positions in which they are placed bearings, a crank-shaft, 0, provided with a 2 5 when about to be operated upon. Fig. 2 is an driving-pulley, H, and said crank-shaft is con- 7 5 end elevation of the spindle-nut, together with nected with the horizontal arm of lever D by the forked end of the elbow-lever engaging a pitman, '0, whose upper end is connected to therewith, and in which is shown, in cross-secsaid lever by a bolt passing through slot to tion, the form of a screw upon which it opertherein, by means of which the end of the pit- 0 ates. Fig. 3 is a side elevation of said nut. man may be adjusted toward and from the end Fig. 4 is a plan view of the end thereof, and of the lever, for the purpose hereinafter ex- Fig. 5 is a view of one of two slides which are plained. pivoted to said forked ends of said lever and The operation of my machine is as follows engage in vertical grooves, one on each side The plug a and body 0 of the cock are put in of said nut. the machine, as shown in Fig. 1. The usual A is the bed of the machine. I) b are legs. grinding-substance is applied to the plug, and c is a girth extending from leg to leg. 01 is an the machine is set in motion through a belt ordinary lathe tail'stock, mounted on bed A running upon pulley H, or by other suitable in the usual manner. 0 is a head-stock promeans, whereby the crank-shaft 0 is revolved.

4o vided with spindle boxes of ordinary 0011- This causes a vibratory motion in the bell- 9o struction. h is a spindle, provided with bearcrank lever D, whereby the nut r is caused to ings to fit into the said boxes in the head-stock have a reciprocating motion on the spindle h,

e, and is made of spiral form between its bearcausing the latter and the plug it to have a reings, as shown, and its inner end has a screw ciprocating rotary motion, and while the plug 5 cut thereon, to adapt it to receive the chuck is being turned the operator grasps the body 5 t in the usual way. The form of this spindle, o by its shanks, and holding and pressing it in cross-section, is seen in Fig. 2. upon the plug the latter is rotated back and Chuck 1' is provided with a center, 2', and an forth in the body, and the two are very quickly arm, '5 extending out over and in aline with ground to a fit. As the forked ends of lever 50 center i. D operate upon nut r the slides s have a re- 10o eiproeating vertical motion in the grooves mm in the sides of said nut.

In practice, it is desirable to have the plug, While being ground, turn in the bod a little more than one revolution to grind a true seat for itself within it; and to provide means for adjusting the stroke of lever D, so that the rotary motions of spindle h may be adjusted to the degree of turn required for plugs of different diameters, thehorizontal arm of lever D is provided with the slot a. so that the point of the pitman-connection with it may be changed to different distances from its l'ulcrum, causing nut r to be moved more or less each side of the centre of spindle h between its bearings.

From the above it will be seen that while the two parts of nut 1' are kept properly secured against the spindle ii any horizontal movement of said nut will cause a corresponding rotary motion in the spindle. Hence the action of the lever D and said nut upon the spindle when proper heed is given to said adjustment, will be attended with no shock when the motions are reversed, but the machine will operate steadily and Without noise.

Vhat I elann as my invention is- 1. In acock-grini'ling machine, the combination, with a chuck for holding the plug ofa cock, of a spindle of spiral form, ofa nut fitted to said spindle, and of appliances for holding and moving said nut reciprocally upon said spindle, substantially as and for the purpose set forth.

2. In combination, the chuck i, the spirallyformed spindle h, the nut 1', the bell-crank lever l), and appliances for imparting avibratory motion to said bell-crank lever, substantially as and for the purpose set forth.

3. The combination with the spindle h, nut a", crankshaft 0, and pitman o, of the bellcrank lever D, hzwing the slot at in its horizontal arm, substantially as and for the purpose set forth.

EDGAR V. TANNER.

Witnesses:

A. S. HILLS, H. A. Gnarls. 

